John hewitson and elijah tolman



J. HEWITSON & E. TOLM'AN. Machine for Ornamenting Metal Surfaces.

No. 225,829. Patented Mar. 23,1880.

ATTORNEYS.

N.PETERS, FHOTO-LITHOGRAPHER, WASHINGTON, D c.

UNITED STATES PATENT OFFICE.

JOHN HEWITSON AND ELIJAH TOLMAN, OF TAUNTON, MASSACHUSETTS, ASSIGNORS TOREED & BARTON, OF SAME PLACE.

MACHINE FOR ORNAMENTING METAL SURFACES.

SPECIFICATION forming part of Letters Patent No. 225,829, dated March23, 1880.

Application filed September 20, 1879.

To all whom it may concern:

Be it known that we, JOHN HEWITSON and ELIJAH TOLMAN, of Taun ton, inthe county of Bristol and State of Massachusetts, have invented a newand Improved Machine for Ornamenting Metal Surfaces; and we do herebydeclare that the following is a full, clear, and exact description ofthe same, reference being bad to the accompanying drawings, forming partof this specification.

This invention consists of a machine for producin g all kinds of chasedor matted surfaces, but more particularly for producing an improvedfinish, which we call the snow-flake finish.

It consists in the peculiar construction and arrangement of mechanismfor imparting a combined rotary and impacting movement to a tool, andalso in the peculiar construction of the face of the tool, ashereinafter fully described.

Figure 1 of the drawings is a side elevation, partly in section, andFig. 2 a plan view, of the machine. Fig. 3 is a side view of thefinishing-tool for producing the snow'flake finish. Fig. 4 is anenlarged face view of the same.

In said drawings, A represents a frame-work, in which is mounted, insuitable bearings, a horizontal shaft, B, which shaft is driven bya.fixed pulley, 0, having a loose companion pulley, O, by its side. Uponthis shaft is fixed a six-pointed cam, D. Pivoted to the framework, atits back end, is a hammer, E, which is alternately lifted and allowed tofall by the action of the camupon the spring F and roller a, arrangedbetween the hammer and the cam. To secure a positive and elastic blowthis ham- 11161, is drawn downwardly by a spring, G.

H is an arm fixed to a standard rising from the base-frame, which armcarries at its outer end a stationary sleeve, b, in which revolves thevertical tool 0, located directly beneath the face of the hammer, and insuch proximity to the same as to be struck by each descent of thehammer.

This tool for. giving the snow-flake finish has a working-face composedof fine parallel ridges and center-punch indentations, as shown in Fig.4, and is rotated by a belt, 9, passing around a pulley, d, on the tool,and also around a pulley, c, on the drive-shaft, and is held up by aspiral spring, f, arranged in the lower end of the sleeve b.

The lower end of the tool is the operatingface, which, it will be seen,intermittingly advances against the surface to be finished with animpact derived from the blow of the hammer, having meanwhile a rotarymotion about its axis from the action of the belt. The sudden impact ofthe tool against the surface to be finished causes a set of parallelindentations on the metal surface, which appear in patches, with theparallel lines of one patch appearing at a different angle to those ofthe next. As the time of contact between the tool and sur face to befinished is only momentary, the parallel lines are not obliterated bythe rotary action, the latter serving only to place the patches indifferent angular relation on the metal surface.

In operating upon the article, the latter, as shown at X, is preferablyheld upon a handle, I, which latter is suspended from a pulley above bya rope or cord, J, by pulling upon which, either by the hand or by atreadle, the object is brought up to the operating-tool, while saidobject may be turned to present new surfaces by means of the handle I.

In making use of the peculiar organization of machine for impartingmotion to the tool we do not confine the same to its use with thepeculiar form of tool described, nor do we confine ourselves in the useof this peculiar construction of tool to the mechanism here shown foroperating it.

In defining our invention more clearly we would state that we are awarethat a tool for ornamenting metal has heretofore been constructed to actwith a combined rotary movement and endwise impact; but in such case theendwise reciprocation was effected by a cam and spring within the tubecontaining the tool and operating on the principle of a dental plugger.Such construction, however, does not afford the sudden and elastic blowwhich is required to give the desired finish, nor a sufficient means foradjusting the strength of said blow, as when the hammer is arrangedexteriorly for endwise impact.

We are aware, also, that a tool having a face of parallel hair-linesisnot new, and we do not claim the same, except when the lines are brokenup by the center-punch indentations, which have the eflect to break upthe continuity of the lines produced on the indented surface of metalbeing ornamented, and, by

- breaking up the continuity of the lines of light reflected therefrom,give a more ornamental design.

With respect to thedesign formed bytheuse of the tool herein described,we do not claim this jointly in this application, as the same has beencovered by John Hewitson singly in an application for a design patentfiled J anuary 3, 1880.

Having thus described our invention, What we claim as new is- 1. Thecombination, with the tool having a free rotary and longitudinalmovement, of the 20 belt 9 and pulley e, and the cam D, and horizontalspring-actuated hammer E, having its face in line with the axis of thetool, substantially as shown and described.

2. The tool having a face wrought into fine z 5 parallel ridges dottedwith center-punch indentations, as shown and described.

' JOHN HEWI'ISON.

ELIJ AH TOLMAN. Witnesses:

T111210. P. HALL, B. B. PEIRcE.

